Grinding and polishing material



UNITED STATES PATENT OFFICE.

M. LINDSEY, OF PITTSBURG, PENNSYLVANIA.

GRINDING AND POLISHING MATERIAL.

SPECIFICATION forming part of Letters Patent N o. 373,239, datedNovember 15, 1887.

Applicationfiled April 1, 1887. Serial No. 233,309. (No specimens.)

To all whom it may concern:

Be it known that 1, CHARLES M. LINDSEY, of Pittsbur'g, in the county ofAllegheny and State of Pennsylvania, have invented a new and ImprovedProcess of Making Grinding and Polishing Material, of which thefollowing is a full, clear, and exact description.

This invention consists in a process of making grinding and polishingmaterial of pulverized steel, suitablefor usein glass-houses,machine-shops, and elsewhere, and on wheels and otherwise, in the placeof emery, substantially as hereinafter described.

In the manufacture of my improved grinding and'polishing material orpowder I have first taken steel in the rod and, putting it into afurnace, heated it to a temperature of about fifteen hundred (1500)degrees Fahrenheit, more or less, and then taken it out of the furnaceand placed it in a vat or bath containing cool or cold water, commonsalt, and soda, in the proportion of about two (2) quarts of salt andone (1) pound of soda to each gallon of water; but I do not confinemyself to these proportions. This treatment of the steel crystallizes itand makes it very hard. I then pulverize the steel by hammer orotherwise, after which the material is ready to be put up in boxes,bottles, or other packages ready for use.

Having thus fully described my invention, I

claim as new and desire to secure by Letters Pat-

